To be honest I'm a little puzzled: so far as I can see the main effect of those additives would be to make the stuff a little gloopier (more viscous). Perhaps it's just a marketing things: one reviewer guessed it was some sort of light oil, based on the "non conductive" sales pitch and the way it poured and felt on his fingers.

It's designed to make it less able to support metal ions in solution (galvionic corrosion). C'mon, a site that lists water as dihydrogen oxide is gotta be a n00b fisher. The alcohol (layryl means it is clear) and glycol is antifreeze and the glycerin lubricates the pump (not sure how good that is in the long run). Xantham gum is a stabiliser for the rest of the ingredients. It basically stops them separating out onto your pipes, blocks and pump when the system is powered down.

What you'll find is that after a month or two it will have to be changed as it breaks down (common prob with antifreeze). Waterwetter or equivalent + distilled water is still by far the best method.

If the alcohols were there as a major proportion of the mixture, that effect might start to become significant. However, if metal salts are less soluble in the solution than in water, that just means the corrosion products will end up as solid rather than in solution sooner... except that the xanthan gum stabilises colloidal suspensions. I don't see it having a big effect one way or the other, but I'm not sure what they were thinking.

scotty6435 wrote:

(galvionic corrosion).

The question of whether the corrosion is accelerated by mixed-metal "galvanic" effects is irrelevant here. ("Galvanic" not "Galvionic".)

scotty6435 wrote:

C'mon, a site that lists water as dihydrogen oxide is gotta be a n00b fisher.

As I read it, the manufacturers used that term in the data sheet they supplied to the people running the overclockers.com site. Presumably they were hoping to impress someone: we agree there.

scotty6435 wrote:

The alcohol (layryl means it is clear) and glycol is antifreeze

First, the word. The etymology of "lauryl" (not "layryl") is from laurel; my guess is that lauryl alcohol or lauric acid was originally extracted from that plant. Why do you say it means it's clear? Anyway, nowadays "lauryl" just refers to a chain of twelve carbon atoms.1-Dodecanol is an oily liquid, with a melting point of 24-27C, and it's insoluble in (immiscible with) with water. (Presumably the gum and/or glycerin helps to stop it from separating out and floating to the top.) Being insoluble, it won't affect the melting/freezing point.The propylene glycol will lower the freezing point: its own melting point is -59C and it is miscible with water.The lowering of the freezing point will be small given the small concentration of additives. Anyway, does it matter at all? How many people want to chill their water below its normal freezing point?

scotty6435 wrote:

and the glycerin lubricates the pump (not sure how good that is in the long run).

The mixture might be a little more effective as a lubricant than plain water (but remember that increased viscosity does not mean a better lubricant). I'd imagine that if there were any benefit the makers would be shouting about it though.Oh, and (I'd have to check but) I'd expect it to lower the freezing point unless there's an awful lot of it: it's miscible with water and its melting point is 17.8C. Also it helps to stop the 1-dodecanol from separating out.

scotty6435 wrote:

Xantham gum is a stabiliser for the rest of the ingredients. It basically stops them separating out onto your pipes, blocks and pump when the system is powered down.

That's only needed for the lauryl alcohol. It also increases the viscosity, has some lubricating ability and stabilises suspensions.

scotty6435 wrote:

What you'll find is that after a month or two it will have to be changed as it breaks down

It wouldn't surprise me, but what makes you think it does? (The makers quote a shelf life of five years but say nothing about life in use.)

scotty6435 wrote:

(common prob with antifreeze).

Really? It lasts for years in cars. What makes you think so?

scotty6435 wrote:

Waterwetter or equivalent + distilled water is still by far the best method.

I'm not sure that water wetter helps. Certainly some kinds are reported as causing problems. I don't think I've seen any tests showing improved performance.

For inhibiting corrosion, I would recommend "life extender" additives for car engine coolant, or additives intended for domestic central heating systems (the kind with hot water circulating through radiators).

Note that the makers/sellers of this XP stuff say that the liquid itself is not corrosive but they don't say it inhibits or protects against corrosion. Also they don't mention growths of algae, bacteria or fungi, but they do say the additives are all food-grade so presumably living things will do just fine in it. (No, they're not used as preservatives in food.)

Jesus! You produce this stuff or are you just a freelance chemist browsing the forums? Basically, the point of the post was to say that it really isn't a wonder product and a similar, or better efffect can be made much cheaper by adding a concentrate to distilled water. (took me 5 mins to write my post, how long to write yours... ) And it's a bit picky corecting a spelling mistake....

...Also they don't mention growths of algae, bacteria or fungi, but they do say the additives are all food-grade so presumably living things will do just fine in it. (No, they're not used as preservatives in food.)

I got growths in my very first water system, which was filled with 100% Fluid XP. I don't know if that was the fault of the coolant or my fault (most likely mine), but I got growth within the first week, and it didn't seem to me that the Fluid XP was doing anything at all to prohibit it. The growth was a feathery, white looking streamy material that clung to my tube walls. Multiple hydrogen peroxide flushes of the system turned the feathery white streamy gunk into gross-as-all-hell orange particulates. My cousin, who was helping me with the flushing process, was about to puke from seeing it.

Why do you care if your fluid is non-conductive? (Conductivity is not the problem with using just plain water in a WC loop)

direct contact like in Spray Cooling
basically a direct die phase change
(or within a block but then it wouldnt need to be non-conductive)
that fluid however wouldnt be a good choice with a boiling point of 99C
so just imersion for that fluid

the Heat Transfer Coefficient (W/cm² °C) of Spray cooling is far superior to other methods

oh I dont know
think the application is slight larger than you might imagine
starting with the US Army :p

spray cooling is used for thermal control on alot of "ruggedized" equipment, and is making inroad to high density enterprise computing, of course in the high density application direct die isnt necessary or even perferable

but "spray cooling" itself is one of those thermal technologies that is just going to become more prevelant, sort of like heatpipe technology is now, about four years ago there where no consumer level products employing heatpipes (but they where readilly available to enterprise)
now they are everywhere

its actually a super simple technology with just a micropump to go wrong
but like most phase change its all about getting the appropriate balance
putting it outside of the DIY category currently
its been around for a long time as well, but outside of supercomputers wasnt adopted for quite awhile

while a nonconductive fluid isnt necessary for direct die, it is perferable
(ask SurlyJoe at Spodes) and for typical enterprise immersion or direct component cooling is universally employed, generally Perfluorocarbon (3M's Fluorinert)

IIRC, spray cooling was used (dunno if it still is) in a number of supercomputers (I know for a fact that Cray used it). I believe they used Fluorinert for it; I have no idea how much it costs, though.

very quiteone small micropump being the only pump and its a canned magnetic drive(correction its 10 atmospheres) a cut and paste-------------------------------------------------------------------------------

its an area of active research for methey even have spray cooled "waterblocks" for lack of a better wordthe trick with all this is actually dealing with fluorinert which will leak through a seal that would withstand 10 atmospheres of pressure if it was water, the proper selection of the flourinert type for the phase change, the proper selecction of the pump, and they aint cheap pumps, the proper selection of the atomizers\nozzles which impact the phase change

think of it as a hybrid water cooled phase change rig its both simpler in operation, but far far tougher to determine the right component selectionRight now I know of no overclocker employing it, and have yet to determine the lowest possible temperature it could reasonably be used for (again that would depend on a number of factors)but Im very interested in it

It's a general principle of electrical engineering that volts and fluid don't mix, which is why one is ill-advised to balance a Pepsi can on one's CPU. I first saw SprayCool technology at the Navy League show in Washington a year ago, and the sight of a computer in a transparent case, with a gentle mist of fluid spraying across the circuit cards, was impressive.

I kept waiting for the normal flash-POOF-evil-smellsequence, but it didn't happen. The SprayCool people explained that the fluid being used was nonconductive and noncorrosive (which eliminates Pepsi on two counts), and that they were looking for some tough cooling problems to solve.

This quest has borne fruit. Northrop Grumman has chosen SprayCool technology for the Airborne Signals Intelligence Payload (ASIP) system that is being developed for the U-2 Dragon Lady.

It's a difficult problem because the ASIP package is installed in an unpressurized area on the U-2 - and at altitudes pushing 80,000 feet, there's not a lot of air to cool anything with. Moreover, the electronics need to be cooled under some circumstances and heated in others. The SprayCool chassis has been flight-tested on the U-2 over the past year and has now been selected for production and sustainment.

SprayCool chassis are also used on the Predator and Global Hawk. Not only is the system the only way to cool modules above 70,000 feet in an unpressurized environment (other than built-in liquid cooling) but it is also closed-loop, keeping airborne contaminants away from the electronics.

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